单选题：Whatcan we learn about erosion from the last paragraph?

题目分类：初中英语
题目类型：单选题
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题目内容：

Whatcan we learn about erosion from the last paragraph? A．Calcium,sodium, potassium, and magnesium are thoroughly dissolved in the process of chemicalerosion.
B．Insolubleions weaken the fertility of farmlands.
C．Mechanicalerosion refers to the process of insoluble ions being left behind in the soil.
D．Chemicalerosion and mechanical erosion are responsible for the erosion of thecontinent.

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答案解析：

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